Method for determining a straight line intersecting the axis of

Details Method for determining a straight line intersecting the axis of Method for determining a straight line intersecting the axis of

1977-11-02

1979-12-04

Corbin, John K.

Optics: measuring and testing

By alignment in lateral direction

With light detector

G01B 1126

Patent

active

041769627

ABSTRACT:
Method for determination of a straight line intersecting the axis of an optical radiation beam of a photoelectric levelling apparatus where the optical radiation beam transmits power from a stable radiation transmitter to a stable radiation receiver by screening the optical radiation beam by a screen and by evaluation of the signal detected by the radiation receiver by means of an evaluation circuit wherein the optical radiation beam is screened by screening means from at least two different sides of the optical radiation beam subsequently in mutually symmetrical positions of the screening means at a simultaneous indication from which side the optical radiation beam is screened, the evaluation circuit is evaluating the magnitude of the signal detected by the radiation receiver in case of screening from different sides of the optical radiation beam and by shifting the screening means transverse to the optical radiation beam the position is found. When the signals detected by the radiation receiver at screening from different sides are of the same magnitude, then the axis of symmetry of curves which form screening edges of the screening means in mutually symmetrical positions of the screening means represents the straight line intersecting the axis of the optical radiation beam.

REFERENCES:
patent: 3129335 (1964-04-01), Stewart
patent: 3604940 (1971-09-01), Matthews
patent: 3730633 (1973-05-01), Kennedy
patent: 3900738 (1975-08-01), McKay
patent: 3945730 (1976-03-01), Simecek et al.

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